Anode structure for an organic light emitting diode display device

Abstract

An anode structure of an organic light emitting diode display device, includes an insulating interlayer disposed on a silicon substrate, a first metal layer pattern disposed on the insulating interlayer comprising a first metal to be configured to upwardly reflect light, a second metal layer pattern formed on the first metal layer pattern comprising a second metal having a work function of 4.0 eV or more, and a diffusion barrier layer pattern interposed between the first metal layer pattern and the second metal layer pattern for preventing elements of the first metal or the second metal from diffusing between the first metal layer and the second metal layer.

What is claimed is: 
     
       1. An anode structure of an organic light emitting diode display device, the anode structure comprising:
 an insulating interlayer disposed on a silicon substrate; 
 a first metal layer pattern disposed on the insulating interlayer, the first metal layer pattern comprising a first metal configured to upwardly reflect light emitted from an organic light emitting unit disposed on the anode structure; 
 a second metal layer pattern formed on the first metal layer pattern, the second metal layer pattern comprising a second metal having a work function of 4.0 eV or more; and 
 a diffusion barrier layer pattern interposed between the first metal layer pattern and the second metal layer pattern for preventing elements of the first metal or the second metal from diffusing between the first metal layer and the second metal layer. 
 
     
     
       2. The anode structure of  claim 1 , wherein the diffusion barrier layer pattern comprises metal nitride. 
     
     
       3. The anode structure of  claim 2 , wherein the diffusion barrier layer pattern comprises titanium nitride. 
     
     
       4. The anode structure of  claim 1 , wherein the first metal comprises an aluminum-copper alloy, the second metal comprises cobalt, and the diffusion barrier layer pattern comprises titanium nitride. 
     
     
       5. The anode structure of  claim 1 , wherein the diffusion barrier layer pattern has a thickness of about 25 to 50 Å. 
     
     
       6. An anode cell array unit for an organic light emitting diode display device having an organic light emitting diode unit being disposed on an upper portion of a substrate structure unit including an active element for each of a plurality of pixels, the anode cell array unit comprising:
 an anode structure disposed on the substrate structure unit and configured to be electrically connected to the active element for each of the plurality of pixels, the anode structure including an insulating interlayer being isolated from the active element, a first metal layer pattern disposed on the insulating interlayer, and the first metal layer pattern including a first metal configured to upwardly reflect light emitted from the organic light emitting unit, a second metal layer pattern formed on the first metal layer pattern comprising a second metal having a work function of 4.0 eV or more, and a diffusion barrier layer pattern interposed between the first metal layer pattern and the second metal layer pattern for preventing elements of the first metal or the second metal from diffusing between the first metal layer and the second metal layer; and 
 an anode cell isolator for each pixel of the plurality of pixels penetrating through the anode structure and protruding upward from the anode structure, each anode cell isolator being configured to define a one of plurality of cells by isolating the pixel from others of the plurality of pixels. 
 
     
     
       7. The anode cell array unit of  claim 6 , wherein the first metal comprises aluminum-copper alloy, the second metal comprises cobalt, and the diffusion barrier layer pattern comprises titanium nitride. 
     
     
       8. The anode cell array unit of  claim 6 , wherein the diffusion barrier layer pattern has a thickness of about 25 to 50 Å. 
     
     
       9. The anode cell array unit of  claim 6 , further comprising: a leakage current suppressing layer pattern disposed on the anode structure and surrounding a sidewall of each anode cell isolator to suppress a leakage current that in an interface region adjacent to an interface between each anode cell isolator and the anode structure. 
     
     
       10. The anode cell array unit of  claim 9 , wherein the leakage current suppressing layer pattern makes contact with an upper sidewall of each anode cell isolator and a top surface of the anode structure. 
     
     
       11. An organic light emitting diode display device comprising:
 a substrate structure unit including a substrate and an active element for each pixel of a plurality of pixels disposed on the substrate; 
 an anode cell array unit disposed on the substrate structure unit and electrically connected to the active elements, the anode cell array unit comprising—
 an anode structure having an insulating interlayer being isolated from the active elements, 
 a first metal layer pattern disposed on the insulating interlayer comprising a first metal to be configured to upwardly reflect light emitted from an organic light emitting unit, 
 a second metal layer pattern formed on the first metal layer pattern comprising a second metal having a work function of 4.0 eV or more, 
 a diffusion barrier layer pattern interposed between the first metal layer pattern and the second metal layer pattern for preventing elements of the first metal or the second metal from diffusing between the first metal layer and the second metal layer, 
 and an anode cell isolator for each of the plurality of pixels penetrating through the anode structure and protruding upward from the anode structure, and each anode cell isolator defining a cell by isolating the pixel from others of the plurality of pixels; 
 
 wherein the organic light emitting unit is disposed on the anode cell array unit and is configured to light in response to a signal of a signal control unit.